This seems to be a recurring problem for which there is no optimum solution, that I've found anyway. Especially, if you are trying to avoid cold bridging.
One solution would be to infill your cavity with concrete and block (in your last picture) and then fix Compacfoam on top. That comes in various depths including 50mm which is close to your 47mm.
There is a discussion here:
http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=16054